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FWT’s
gas filling system is an accessory for the various LET counters
and Ionization Chambers presently available. Its principal purpose
is to serve as an interface between a mechanical vacuum pump, a
supply of tissue- equivalent gas, and the LET counter.
The gas filling system is composed of:
1) an accurate mechanical vacuum gauge with a range from 0 to 5
cm, 0 to 10 cm, or 0 to 20 cm Hg; 2) connections to allow attachment
of a mechanical vacuum pump and a supply of tissue equivalent gas
3) bellows sealed valves with Teflon® seats to control the vacuum
and gas inlets and to serve as a protection device for the gauge;
and
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High Quality Mechanical Gauge
Use to Fill
All FWT detectors
Helium Leak
Tested
Insures User
of Proper Gas Fill
No Switching
of Gas Lines Necessary
Easy to Use
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4)
a connector to allow attachment of the LET counter. The parts are
assembled on a rigid aluminum plate with deep engravings showing
the vacuum piping and component function.
The system has been assembled with extreme care so that contamination
is at a minimum. Individual components and the assembled complete
system have been helium leak tested to insure leak-free performance.
Specifications
 Valves: Bellows
type, Teflon® seats for positive shutoff
Gas Inlet
Connector: Mates with Swagelok® B-QC4-D-400
Counter Inlet
Connector: Mates with Swagelok® B-QC4-D-400
Vacuum Pump
Connector: Pipe suitable for clamping 1/2-in. to 3/4-in. I.D. vacuum
hose
Vacuum Pump
Requirements: Mechanical pump, 30 liters per minute, 5 x 10-5 mm
Hg ultimate
Vacuum Gauge:
Aneroid type, 0 to 10 cm Hg standard, 6-inch dial, accuracy <±0.012
cm Hg
Leakage:
Individual parts and complete system helium leak checked, leak rate
<2x10-5 std cc/sec
Dimensions:
16 in. (40.5 cm) long, 13 in. (33 cm) wide, and 10 in. (25 cm) high
Weight: 19
lb. (8.6 kg) with cover
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Ordering Information
GFS-1:
Gas Filling System with cover
Various modifications of the system are possible, such as vacuum
gauges of different ranges (0 to 10 cm Hg standard), additional
valves and connectors, rack mounting, etc. Please contact FWT
for additional information.
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